today I discovered one strange problem (but I can't tell for sure when it started) :

in the Application Menu (the K menu with the M icon of Maui) some launchers don't work; these are the launchers that I created in the past (and they work good in the past) or launchers created by some external deb packages like 4k Video Downloader and Opendesktop App.
The strange thing is that the keyboard shortcuts created for them work good and, also, if I create a shortcut in Quick Launch widget or on the panel starting from entries in the K menu, they work good.